Robtex

Up: 194.49.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.49.72.0/23
Down right: 194.49.74.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
194.49.72.91	PTR	mail.okw.com
194.49.72.91	A	mail.okw-gehaeuse.com
194.49.72.91	A	mail.okw-knoepfe.com
194.49.72.100	A+PTR	mail.okw.com
194.49.72.100	A	mail.okw.com.au
194.49.72.100	A	mail.c-creativ.com
194.49.73.49	A+PTR	mail.emitec.com
194.49.74.74	PTR	zepits.zeppelin.com
194.49.74.75	A	baggerboerse.de
194.49.74.76	PTR	cert.zeppelin.com
194.49.74.79	A+PTR	webmail.zeppelin.com
194.49.74.80	A+PTR	outlook.zeppelin.com
194.49.74.81	A	*.zeppelin.com
194.49.74.81	A	owa.zeppelin.com
194.49.74.81	A	mail2.zeppelin.com
194.49.74.94	A+PTR	z2fa.zeppelin.com
194.49.74.111	A	du-und-zeppelin.com
194.49.74.113	A+PTR	wac-test.s-add-ins.zeppelin.com
194.49.74.122	A	z-intern.com
194.49.74.134	A	www.zeppelin-kundenportal.de
194.49.74.135	PTR	www.group.zeppelin.com
194.49.74.135	A	group.zeppelin.com
194.49.74.136	PTR	services.zeppelin.de
194.49.74.150	A+PTR	proxy-a.zeppelin.de
194.49.74.151	PTR	proxy-b.zeppelin.de
194.49.74.159	PTR	proxy01.zeppelin.de
194.49.74.160	A+PTR	smtp01.zeppelin.de
194.49.74.163	A	smtp02.zeppelin.de
194.49.74.164	A+PTR	smtp01.zeppelin.com
194.49.74.165	A+PTR	smtp02.zeppelin.com
194.49.75.5	A+PTR	group-qs.zeppelin.com
194.49.75.6	A+PTR	www.group-qs.zeppelin.com
194.49.75.13	A+PTR	group-qs.zeppelin.de
194.49.75.13	A	proxyqs.zeppelin.de
194.49.75.17	A+PTR	proxy-q.zeppelin.de